Rust methods: Difference between revisions
From wikinotes
(→Basics) |
|||
Line 5: | Line 5: | ||
}} | }} | ||
= | = Associated Functions = | ||
<blockquote> | <blockquote> | ||
Rust lets you add methods to structs using <code>impl</code>. | Rust lets you add methods to structs using <code>impl</code>. | ||
* <code>self</code> is a reference to the instance | |||
* <code>Self</code> is a reference to the object-type | |||
* <code>impl</code> allows you to associate functions to an object | |||
* you can have as many <code>impl</code> blocks as you'd like | |||
<syntaxhighlight lang="rust"> | <syntaxhighlight lang="rust"> | ||
Line 17: | Line 21: | ||
impl RgbColor { | impl RgbColor { | ||
fn red() -> Self { | |||
Self { | |||
r: 255, | |||
g: 0, | |||
b: 0, | |||
} | |||
} | |||
fn brighten(&self) { | fn brighten(&self) { | ||
self.r += 8; | self.r += 8; | ||
self.g += 8; | self.g += 8; | ||
self.b += 8; | self.b += 8; | ||
} | } | ||
} | } | ||
// methods | |||
let c = RgbColor{r: 8, g: 8, b: 8}; | let c = RgbColor{r: 8, g: 8, b: 8}; | ||
c.brighen(); // {r: 16, g: 16, b: 16} | c.brighen(); // {r: 16, g: 16, b: 16} | ||
// class methods | |||
red = RgbColor::red() | |||
</syntaxhighlight> | </syntaxhighlight> | ||
Revision as of 19:57, 7 February 2023
Rust lets you add methods to structs.
TODO:
other types? what's the full spectrum here?
Associated Functions
Rust lets you add methods to structs using
impl
.
self
is a reference to the instanceSelf
is a reference to the object-typeimpl
allows you to associate functions to an object- you can have as many
impl
blocks as you'd liketype RgbColor{ r: u8, g: u8, b: u8, } impl RgbColor { fn red() -> Self { Self { r: 255, g: 0, b: 0, } } fn brighten(&self) { self.r += 8; self.g += 8; self.b += 8; } } // methods let c = RgbColor{r: 8, g: 8, b: 8}; c.brighen(); // {r: 16, g: 16, b: 16} // class methods red = RgbColor::red()Similar to go, you can use the
.
operator to access methods on either a reference or an instance.
rust will automatically dereference it for you.